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Lilconfig ⚙️

A zero-dependency alternative to cosmiconfig with the same API.

Installation

npm install lilconfig

Usage

import {lilconfig, lilconfigSync} from 'lilconfig';

// all keys are optional
const options = {
    stopDir: '/Users/you/some/dir',
    searchPlaces: ['package.json', 'myapp.conf.js'],
    ignoreEmptySearchPlaces: false
}

lilconfig(
    'myapp',
    options // optional
).search() // Promise<LilconfigResult>

lilconfigSync(
    'myapp',
    options // optional
).load(pathToConfig) // LilconfigResult

/**
 * LilconfigResult
 * {
 *   config: any; // your config
 *   filepath: string;
 * }
 */

Difference to `cosmiconfig`

Lilconfig does not intend to be 100% compatible with cosmiconfig but tries to mimic it where possible. The key differences are:

no support for yaml files out of the box(lilconfig attempts to parse files with no extension as JSON instead of YAML). You can still add the support for YAML files by providing a loader, see an example below.
no cache

Options difference between the two.

cosmiconfig option	lilconfig
cache	❌
loaders	✅
ignoreEmptySearchPlaces	✅
packageProp	✅
searchPlaces	✅
stopDir	✅
transform	✅

Loaders examples

Yaml loader

If you need the YAML support you can provide your own loader

import {lilconfig} from 'lilconfig';
import yaml from 'yaml';

function loadYaml(filepath, content) {
    return yaml.parse(content);
}

const options = {
    loaders: {
        '.yaml': loadYaml,
        '.yml': loadYaml,
        // loader for files with no extension
        noExt: loadYaml
    }
};

lilconfig('myapp', options)
    .search()
    .then(result => {
        result // {config, filepath}
    });

ESM loader

Lilconfig v2 does not support ESM modules out of the box. However, you can support it with a custom a loader. Note that this will only work with the async lilconfig function and won't work with the sync lilconfigSync.

import {lilconfig} from 'lilconfig';

const loadEsm = filepath => import(filepath);

lilconfig('myapp', {
    loaders: {
        '.js': loadEsm,
        '.mjs': loadEsm,
    }
})
    .search()
    .then(result => {
        result // {config, filepath}

        result.config.default // if config uses `export default`
    });

Version correlation

lilconig v1 → cosmiconfig v6
lilconig v2 → cosmiconfig v7

readme.md